Whenever you save a problem, either in draft mode or as Final, MATLAB® Grader™ saves a copy.
To view the problem history, select Actions > View Problem History.
By default, MATLAB Grader displays only the versions saved as Final. To view problem drafts also, select View draft versions.
To view a particular version, click the date and time link.
When you are viewing a particular version, you can navigate forwards and backwards through older and more recent versions using the navigation arrows.